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Local work-function manipulation by external optical stimulation

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arxiv 2402.09375 v2 pith:LBZY3WTL submitted 2024-02-14 cond-mat.mes-hall

Jan Böhnke , Beatrice Andres , Larissa Boie , Angela Richter , Cornelius Gahl , Martin Weinelt , Wibke Bronsch This is my paper · ORCID
classification cond-mat.mes-hall
keywords azobenzenefunctionlaseropticalworkwork-functionallowapply
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Strongly differing static dipole moments of the trans and cis isomers of photochromic azobenzene allow for optical switching the work function of azobenzene-functionalized self-assembled monolayers (SAMs). We apply these properties in a fundamental experiment to manipulate the area size of the switched SAM. Azobenzene molecules were excited by ultraviolet laser illumination and the transient isomerization profile of the SAM was spatially resolved recording photoemission electron microscopy (PEEM) images. Thereby we demonstrate the spatial tuning of the SAM work-function and discuss the role of the laser spot-profile in generating sharp edges or gradual changes of the work function.

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